Gleaming Overseer is a uncommon Creature — Zombie Wizard card from Aetherdrift Commander (DRC), collector number 116. Current market price: $0.30, TCGplayer market prices via Scryfall.
When this creature enters, amass Zombies 1. (Put a +1/+1 counter on an Army you control. It's also a Zombie. If you don't control an Army, create a 0/0 black Zombie Army creature token first.) Zombie tokens you control have hexproof and menace.